What happened guys I don't understand

lmaoo same

Just a flashback of how things with the dude (the one who’s famous and had him locked on the apartment) started.
Dude was 12 when he found out Yul was being abused, he also noticed that Yul only looked at him if he got hurt, so he intentionally keeps on trying to harm himself in order to keep Yul by his side isolating him