FL remember all her past lives. She is reborn and meets ML, a son of a rich CEO and a sickly mother. FL and ML are childhood friends but FL suddenly dies. This traumatized ML because he just lost his mom now the FL. FL is then reborn and wants to reconnect with FL. She's all cool about it and pretty persistent. But ML can't let go of the previous FL so it kinda stops him from falling in love with present FL. It's kinda cute in a twised way I guess. Also same creator of A Good Day to Be A Dog, they make a cameo too.
See You In My 19th Life