Byul and Hyesung's situations are not the same in the slightest.
Hyesung left for 3 weeks when byul was a new born, nowhere close to being old enough to remeber it happening, with a living father and family. He also checked him even during that time, Dojin caught him because he was watching them in the da** park.
Hyesung was abandoned by his mother and had to be raised by an abusive father. His mother didn't come to visit, she didn't check on him, she probably didn't even care that she left her child behind in the first place. The only she probably showed up was because she somehow found hyesung was with a big name artist.
Hyesung left for 3 weeks when byul was a new born, nowhere close to being old enough to remeber it happening, with a living father and family. He also checked him even during that time, Dojin caught him because he was watching them in the da** park.
Hyesung was abandoned by his mother and had to be raised by an abusive father. His mother didn't come to visit, she didn't check on him, she probably didn't even care that she left her child behind in the first place. The only she probably showed up was because she somehow found hyesung was with a big name artist.