In the latter part of the original story, while preparing to ascend to a higher dimension, Choi Kanghu ends up with a large tattoo covering his entire back. This wasn’t just any tattoo; it was made using the shell of an S-grade Void Turtle, obtained from the German and U.S. governments, and the heart scale of the Breath-Absorbing Poison Dragon. The S-grade crafting expert, Han Gaeul, turned these materials into a specialized SS-grade auxiliary equipment.

This item allowed him to automatically consume potions without any cooldown time, which was crucial during intense battles against higher-dimensional beings, where seconds felt like years, and hours like mere moments.

Not only did it automatically absorb healing and recovery potions, but it could also endlessly boost the quality of his mana, making it indispensable for Choi Kanghu as he prepared to challenge and eventually devour the core of a higher being.

"Why is the method for creating this special item, the Black Scale, explained, but the engraving instructions left blank?"

“If you receive the finished product, you’ll understand. The engraving sequence changes in real time, based on the flow of mana in the body.”

Ryuseoha remembered explaining this to Choi Kanghu a few days earlier, during their discussion in the FromHell guild leader’s office, as they reviewed the 'Future Events Log' and planned out their next steps.

“So, you’ll personally engrave it on me, one careful stroke at a time?”

“Huh?”

Her lover had unexpectedly suggested she apply the tattoo herself.

“You know better than anyone the flow of mana in my body.”

“Well, that’s…”

“You’ve felt it intimately enough when we were together.”

His shameless remark had made her blush, if only for a moment.

“And didn’t you want me to teach you the method for life transfer?”

Before she could refuse, citing her lack of agility for moving the Black Scale fast and accurately based on the shifts in his mana circuits, Choi Kanghu had baited her with something too tempting to resist.

“Engraving it directly on my body might be the key to solving your curiosity.”

He’d convinced her that, by closely observing the intertwining of their mana during the brief moments of concentration, she could sense the interactions she’d been longing to understand. It was a rare opportunity to learn the life transfer method without any intimate physical exchanges.

“Let’s start from the third knot here…”

Ryuseoha placed her hand cautiously on the back of Choi Kanghu’s neck, her voice slightly tense. Her hands felt more rigid than usual as she picked up the small Black Scale, no bigger than an apple seed.

She couldn’t help but worry whether her current low stats would allow her to produce a result as impressive as the original story. She wanted to create the perfect engraving for her lover, who relied on it to assist him in battle.

“You’ll have to use your lips.”

She had just begun to feel the flow of mana beneath his skin with one hand while moving the sharp tip of the Black Scale toward his back when Choi Kanghu's low voice offered a new suggestion.

“…With my lips?”

Ryuseoha looked down at the Black Scale, which contained the compressed powers of the Void Turtle and the Breath-Absorbing Poison Dragon, and asked in disbelief.

“Using your hands won’t let you gauge the interaction with the precision needed.”

Choi Kanghu’s calm words made sense. It was something she had experienced herself when she first felt the circuits of his mana.

“Let me just drink a sense and agility booster potion first—”

“No. The side effects could be dangerous.”

As Ryuseoha reached to rummage through the pocket that held the consumable items, Choi Kanghu grabbed her wrist, speaking in a firm tone. His expression was stern, almost like a parent stopping a child from playing with knives.

She should have expected this. Even though he wasn’t completely unaffected by booster potions, she had sensed his reluctance ever since he first insisted she take the expensive enhanced ginseng instead. Even if the body could recover, he didn’t want her to put any strain on it in the first place.

“What do you think about using the buff from [Sanctuary] and combining it with the new skill we recently obtained?”

Knowing that his refusal stemmed from his concern for her, Ryuseoha smiled as she carefully sought his opinion on utilizing another ability.

“Isn’t it risky to stack an untested ability on top of others?”

“If it becomes too much, I’ll stop immediately.”

She understood what he was worried about, so she promised not to push herself. Only after hearing her assurance did Choi Kanghu release her wrist. Ryuseoha swallowed nervously as she faced his back once more.

‘I can do this.’

She then mentally reviewed the effects of the new skill she had obtained, thanks to the level boost she’d received from riding Choi Kanghu’s ‘bus’ straight to level 20.

[Light of Adjustment (Lv.1): Consumes mana to smooth and correct distorted or twisted parts of the target into an ideal form.]

This skill, which she had obtained right after ‘Light of Healing,’ allowed her to perform precise diagnoses and instant surgeries. Those with this skill were in high demand in plastic surgery and orthopedics, and hunters suffering from mana overload would flock to such skilled users.

In this case, the intricate task of engraving the Black Scale required a combination of delicate senses, focus, and quick responses. This new skill could help cover her lack of stats in these areas.

[You have applied the buff ‘Enhanced Agility (3 minutes)’ to the designated target (yourself).]

[You have applied the buff ‘Enhanced Senses (3 minutes)’ to the designated target (yourself).]

With the buffs in place, Ryuseoha placed the rounded end of the Black Scale between her lips. She then knelt on the bed, slowly bringing her lips toward the back of Choi Kanghu’s neck. As soon as her lips touched the vertebrae just below his occipital bone, she could feel the familiar flow of mana pulsing through him.

The powerful mana coursing through his body was like a rushing river, evenly distributed throughout his system. If she weren’t careful, she could be swept away like a leaf in the current.

With the tip of the Black Scale held between her lips, Ryuseoha slowly pressed it to Choi Kanghu’s skin. She closed her eyes, focusing intently. She could feel a large amount of energy concentrated at the third knot in his mana circuit, the same knot she had explored during their first intimate experience, which had been forced on her by Choi Kanghu.

[Skill ‘Light of Adjustment’ is activated.]

As she activated her new skill, she observed how the ideal muscle structure beneath his skin aligned perfectly with the flow of mana, amplifying the stored energy in the third knot. The rhythm of the amplified energy was erratic, much faster than a heartbeat. Ryuseoha patiently waited for the moment when the two types of mana synchronized. At that precise moment, she infused her mana through her lips, liquefying a portion of the Black Scale and embedding it into his skin. The first engraving was a success.

“Whew…”

She let out a long breath of relief, unaware that she had been holding it in. Choi Kanghu’s entire back twitched noticeably beneath her lips, but Ryuseoha, still focused, hadn’t realized what her breath had triggered. She slid her lips down to the fourth knot in his trapezius area, continuing her work.

The same process repeated as she moved to the fifth knot in his deltoid, the sixth in his latissimus dorsi, and the seventh, just above his gluteus maximus. As she succeeded in each engraving, Ryuseoha’s confidence grew. She was starting to get the hang of it.

From that point, the work progressed rapidly. Even the more difficult parts of the design, which required filling non-knot areas with liquid Black Scale, were manageable thanks to the detailed descriptions from the original story.

[You have applied the buff ‘Enhanced Agility (3 minutes)’ to the designated target (yourself).]

[You have applied the buff ‘Enhanced Senses (3 minutes)’ to the designated target (yourself).]

Ryuseoha continued to refresh her buffs, keeping her lips moving constantly for the full 30 minutes until the enhanced ginseng’s effects wore off.

“Haah—”

Finally squeezing out the last drops of the now tiny Black Scale, Ryuseoha let out a long breath she hadn’t realized she’d been holding. She was so drained from her intense concentration that her body wobbled, nearly collapsing. But Choi Kanghu, now turned to face her, caught her up in his arms with ease.

“You did well.”

His lips planted eager kisses all over her face, a display of affection he had been holding back during the engraving process. Ryuseoha couldn’t help but laugh softly, noticing how his earlobes had turned a bright shade of red, despite him enduring the needle-like pain on his back without flinching.

“Were you in a lot of pain?”

Ryuseoha asked playfully, trying to suppress a laugh as she looked up at him. Choi Kanghu's face mirrored her amusement.

“Would you prefer it if I had been?”

“No, of course not. It’s just… this is something new.”

She reached up unconsciously, gently touching Choi Kanghu’s reddened ears, marveling at the sight.

“What is?”

“I’ve never seen you react physically like this before…”

She trailed off, afraid of embarrassing her lover by mentioning how red his ears had become.

“I guess I’ve had to hold back my desire to embrace you for too long.”

His frank response made Ryuseoha blush even more.