So the situation is this : SPOILERS PLEASE DONT READ AND SCROLL DEEP DEEP DOWN THE SEA OF ...

So the situation is this : SPOILERS PLEASE DONT READ AND SCROLL DEEP DEEP DOWN THE SEA OF COMMENTS. WHY ARE YOU READING COMMENTS WHEN YOU OBVIOUSLY KNOW THEIR WILL BE SPOILERS. BY THE WAY THIS ISN'T REALLY A SPOILER BECAUSE LIKE THIS ALL HAPPENED WITHIN THE CHAPTERS THAT ARE ALREADY OUT AND I GUESS IF YOU STILL READ THIS SPOILER AFTER I HAVE REPEATEDLY SAID DON'T READ THIS SPOILER THAN ITS ON YOH AND NOT ME. OMG THIS DISCLAIMER IS LONG HAVE I PROVEN MY POINT YET OR DO YOU NEED MORE TO UNDERSTAND THIS IS A SPOILER SO DON'T BLAME ME I'M JSUT TRYING TO HELP PEOPLE IN THE COMMENTS WHO ARE CONFUSED ABOUT THE SITUATION.

Lee Kyu Ah is Jo Yul's mother. She left Jo Yul oneday with her neighbor next door. But Yul's mother never came back neighbor learned from the police that Yul's mother died. Men in black were trying to find information about Yul's mom and the neighbor got scared she would be in danger if they knew she had Yul so the neighbor took Yul to an orphanage where Yul was abused physically by the director of the orphanage.

Then oneday, Yijoon comes with his mom to the orphanage and meets Yul. He hears Yul sing and this is when his obsession for Yul begins. Yul treats Yijoon coldly but Yijoon keeps coming back until oneday, Yijoon finds out Yul is being abused. So Yijoon considers this a secret between him and Yul (He's happy about it instead of telling an adult this pyscho). Finally, Yijoon actually sees Yul being hit so he comes to intervene and gets hit by the orphanage director. Yul gets really worried for Yijoon because of this incident. But Yijoon being the pyscho he is misunderstands that Yul will only care for him if he is hurt (Cue the emotional abuse on poor Yul). Yijoon gets his parents to adopt Yul (as we know of the current moment since Yijoon's father isn't too fond of Yul) and poor Yul finally learns he has a name. But Yul's hapiness doesn't last because Yijoon is a pyscho who schemes in the shadows to isolate Yul until Yul only stays in the apartment without leaving (Yijoon committing suicide, getting hurt as a treat so Yul can't leave him). Yul meets Luan during this rough time of his life and he knows Luan is using him because our baby Yul has always been a perceptive but silent thinker type.

Luan has his own grudge he is trying to fulfill that we do not currently know of but it most likely has to do with his mom. While investigating Yul, Luan finds out that Yul' mother died in the same incident that killed his mother. The plot goes even deeper however since Yul and Luan's mother went to the SAME school of music. This is where the mystery ends as of right now. What we do know however is that Yul's mother and the driver who killed Luan's mother signed an insurance with a man who we will call Lee (he's just a minion anyways). Now Lee does a insurance fraud business and likes to go to a sex club. This is where the plot goes deeper. Turns out the club is owned by Yijoon's father's acquaintance or more like servant. So we know that Yijoon's dad is involved in Luan's mother's death in some way and Luan most likely is here for revenge. That's why he was targetting Yul at the beginning. Because he wanted to use Yul to get to Yijoon and then finally to get to Yijoon's dad.

Just a hunch but Yul having same last name as Yijoon can't be a coincidence lol. Either Yul is his half brother by the Father or Yijoon was pyscho enough go lie to Yul about his name.