Time machine

Seunghyun and bom has loved each other for years until one day there was a huge fight. A fight so big that it tore them apart. And guess who was the one that started it.. Seunghyun.. A few years later he regretted it deeply. He had no contact with bom overall and has even tried dating other women.. But none were a success and eventually he would see Bom and remember the past. Each time they met she gets even more sad and mad. He just wished and hoped he had a time machine but.... Is it possible? Or would he keep trying to contact her or get someone to try make a time machine or........... Maybe just give up!