At some point it became clear that OG Sihyeon has a sponsor (the members didn't know it's Jaeha or even the fake boyfriend relationship; they simply believed that there's a guy who's sponsoring Sihyeon's debt or someone's debt he's shouldering in exchange for "special services"—you know how beautiful Sihyeon is, right?). Even within the story, the member feeling changed from concern to frustration when Sihyeon continued this toxic relationship or business with no effort to change and even got angry at them for trying to help when it started to affect the group performance, image, and later even fandom. To be fair, OG Sihyeon is scared if his members learn he gives "special service for sponsorship" to a rich client for Jaeha's sake, they will find him disgusting. Until his death, he truly loved his member. The member's guilt is basically that they gave up trying to help him and left him alone as OG Sihyeon asked them. When they saw OG Sihyeon's dead body in the hospital bed, they thought they should have been more aggressive with him, even if it meant more fights and conflict with Sihyeon, if it meant helping Sihyeon.

He's quite literally blinded by love. Jaeha, meanwhile, never loved him; in fact, he quite literally hated Sihyeon. It was precisely because Sihyeon was like this that Jaeha was willing to manipulate Sihyeon's feelings, accept his confession, and pretend to be his boyfriend, because he doesn't have to coerce Sihyeon or do anything, and Sihyeon will do anything for him, even if it means being paraded like a s** slave to rich clients and being abused himself. To be fair, OG Sihyeon was at fault himself for continuing to follow the guy who clearly never liked him from the very beginning until his end, but it's just that he's too pitiful that no one around him could blame him. His level of devotion too Jaeha is abnormal and unhealthy. You see in this chapter that OG Sihyeon was originally well-liked in the group, but remember the cold atmosphere with OG Sihyeon we saw previously from the members' memory? Basically, the member basically begged Sihyeon to share his problems with them, but OG Sihyeon refused to involve his members.

Sanyu has some relationship with Jaeha (OG Sihyeon's sh*tty boyfriend). There was a time when Sanyu and Jaeha almost debuted in the same group. They were together all throughout their trainee days. Basically, Jaeha wants to see Sihyeon's expression if one of his members sees him in this condition. You know how OG Sihyeon hides his suffering from his members and is afraid they'll find out. So, Jaeha, being the twisted person he is, decided to bring Sanyu, whom he knew personally, to Sihyeon and open Sihyeon's blindfold so that Sihyeon can see Sanyu in front of him.

Sanyu's POV when he heard Sihyeon ended up in hospital:
When Sanyu found Sihyeon blindfolded, he was clearly aware of what state of mind Sihyeon was in and that he didn’t want to hear anything. He even knew that Sihyeon wouldn’t want to talk about it. Yet he calmly told Sihyeon that they should return to the dorm and talk it out. Even after all that, if he was still concerned, he should have taken the car keys or at least caught hold of him that day (basically, he believed he's a bystander who contributed to his Sihyeon's suffering by doing nothing). The next thing he heard about Sihyun was that he was in the emergency room. He felt his heart and bones ache to see him lying alone and cold. Just when he thought that it was all over, like a lie, he miraculously revived the next day. It was from that day on; everything Sihyeon did made him regret it. He also noticed the change in personality, tone, and even habits. Although they had the same pale face, it was like he had become a completely different person.

The evil boyfriend who forced og Sihyeon to become a sponsor for his client is Jeaha, the leader of boy group FLOW, the blondie guy who appear in chapter 18 and 34 of the manhwa.

granddaughter from the future. Her name was given by future Mia to commemorate her marriage and love with Abel, thus Miabel (Mia + Abel). Tragically, much of Abel's DNA and intelligence didn't get passed down, only Mia's DNA.