The first time MC dies, it is hinted that ML dies too, possibly a su*cide following MC after he finds out the truth. Before his death he makes a wish on the balcony that he is willing to pay any price to stop MC from dying.

But things don't go as easily as planned, no matter what he did, MC keeps dying if he is involved in any way with ML, from being in a romantic relationship to even simply being a random stranger that he is trying to stop from dying. Eventually, he realises that for MC to live he must die and tries to convince him not to save the ML in the current cycle and as a result he disappears completely from the MC's live. And that's where the story ends.

But in my mind, I suspect that MC would soon follow because MC has fallen for the ML (that calls himself zero) that has cared for him and has become such an important person to MC. Furthermore, MC does not have any other strong connections with people other than ML and was said to have depression previously.

So this might as well be considered a double bad ending.

He Shu learns that he indirectly caused his boyfriend's death so he became a part of Su QingYan's mind and told him how to avoid his death. He fails and each time he goes back farther in their timeline and after x numbers of times he realizes that he will have to die to save Su QingYan. He Shu also erases Su QingYan's memory each time he dies so Su QingYan never remembers He Shu each time he dies. But at the end when Su QingYan realizes that he fell in love with He Shu, he asks He Shu to not erase his memory.

The ending made me sad, but it's what makes the story beautiful. In the end, I was wondering why He Shu, in the 99th world, seemed to recognise QingYan on the rooftop. Also, I wondered why he was committing su*cide?

Then, I realised the title of the story is 4:48, the most vulnerable time for a person to su*cide. It also made me realise that perhaps He Shu didn't forget his experiences in all the worlds, like QingYan did, which is why his wish to rescue QingYan was so strong. When I was reading the novel, it was hard to explain some of He Shu's actions despite knowing that he loved QingYan and I think it was only after completing the story and thinking over it a bit- did I understand.

I feel that the involvement of the cousin was irrelevant and wasted chapters. Even though the story was very predictable (at least to me) I felt that going more in-depth with the characters relationship would have made this perfect. That was the main reason I didn't cry, I didn't see enough of the relationship between the two. Also I have unanswered questions: why was the ML so cold at the beginning? Did he have a affair with his cousin? (I doubt it) The ML seems to know that him dying would prevent the MC for dying, so why try preventing him for seeing his cousin? I'm assuming the reason that the ML try to kill himself at the MC job was because he was in love with the MC and felt like he had no chance. If so then the ML is kinda batsh*t crazy. Like why didn't he try to make the first move? Overall I think the story would have been better if we knew why they were in love and how did they fall in love with each other. I cared about the MC but not really the ML, especially since the earlier chapters made him seem like a dirty cheater. Having the MC fall in love with zero is a perfect way to show this, especially at the end when everything was revealed, but the author mostly skipped over these interactions, so it felt kinda forced. I know I'm mainly talking about the negatives, but these just stuck out to me. Other then those above and some nic picks, I fully enjoyed this piece and fully recommend.

Zero is actually the ML's (I suppose he's the ML, so naturally I am assuming the other is MC) consciousness from the future. When the MC dies, ML wishes to go back to past and save the MC. The first attempt fails, and so he tries again until the 99th time when ML realises that, them being together is the reason why he cannot save the MC. So ML, on the 99th times decides that he won't let the MC meet the ML. But at the end MC dies to save the never-met MC. And then he discovers that one of them must die for the other to live on. So he decides to die himself.