Huahua
Im guessing it's because uijae promised to take care of him until he recovers(? Not sure) but then, as we all know J 'dies' at the rift and leaves him behind, then he gets taken by the Prometheus group and awakens, I'm guessing part of him wanted to join either beaches he wanted to look for J, but he 'died', in the early chapters we can also see sayoung claiming that anything that came out of the rift was his, so maybe he really did want to find J and keep him by his side
You know what hurts the most? When you have no more coupons to open the chapters