Rosie's Questions (2)

Hello, sorry please help me find a manwha. I remember bits of the plot but I don't remember the name.

I remember the mc (bottom) got sucked into the story of a book, he starts living with a boy who has two little brothers and the mc starts taking care of them and cooking for them. They slowly fall in love but there is another guy introduced to the story and he likes the mc as well, and I don't remember how but the mc dies. However he really wants to return with his love so he returns to that universe but in a different body and his lover eventually recognizes him because of his cooking skills and the way he acts towards the little brothers. I don't remember too much but I believe the book was written by his sister or something along those lines.

Please help me find it, thank you!

After the whole reading list going away I lost a bl manga and I don’t remember the name. There are two parts of it, if I remember correctly the first part is about them falling in love in school and the sequel or second season is about them in their adult lives. The top does some research or something at a lab and the last chapter I remember was that he had to move away temporarily for work and he was really sad because he had to be separated from his lover. I remember that the lover was patiently waiting for the top to return and he couldn’t wait to see him.
Please help me, I’d really appreciate it! It was still ongoing and the story takes place in Japan so it was in like Tokyo or one of those major cities.