
Well, MC from "Again" has his face burned and life ruined. He was also deceived by other evil character. Which, Ido none experience that or similar to it at all. He found MC suicide, then also shot himself. He back to the past, supposedly fix everything. Ido has no karma retribution at all. Only a mental torture and dealing with pheromone. That mental torture is a form of guilt as he should experience, not a karma. His physics is fine, career is fine. He didn't have convincing suffering like MC from "Again" or any acceptable reason for doing such horrendous actions towards Sejin.

Ido got influenced too, the past is not all his doing - He was influenced a lot by his brother's lies, that's why in their present life he offed his brother early when he had the chance .. Same goes with Nokyung in Again, he was influenced by his "love" to Hyunjae..
(i searched their names so people won't be confused)

Ido Realizing he's been influenced by lies after Sejin dies and that Sejin was carrying his child, i dunno what low do you want Ido to be, that's why he also killed himself .. Ido and Nokyung are not that different if you ask me, - me - my opinion ..
And all ive been saying is, i hope people are not hating this story in overall/ in general, just because the regressor is the Top - coz as ive said, that's the basis of other people..

His face isn't ruined, his career isn't ruined, his reputation isn't ruined. Nokyung experienced it all and succumb in humiliation until his final days, while Ido isn't. Nokyung spend some time to feel the reap of what his sin is, before the second chance happened while Ido immediately has the second chance. Most likely this is why readers opinions more harsher towards Ido.
Doing suicide after seeing Sejin did it isn't a karma. It's just a guilt, not retribution. Ido just have a shortcut to the second chance. In this second chance, all the that things supposedly to be his redemption are only by him being guilty and set Sejin's life for the good. Helping Sejin is his debt to pay, not his redemption.
im surprised Ido is getting a lot of hate compared to Again MC who also did unspeakable things - i mean they are both got influenced into doing horrendous things that also resulted a death of someone, and also given a chance to redeem themselves for a second time..
i just hope you guys are just influenced because this has a lot of angst than Again and not because Ido is a top - im saying this coz ive seen a lot of comments on diff sites that this is their reason