[TITLE] please I'm looking for a manhwa/manhua/webtoon.

Help Find Title/Source the fl was chatting with her friends (I guess she was in college) and then she went to another place (I guess it's another planet) and she met the ml he gives the military captain vibes, and they got together but he lost his memories with her. I read it along time ago so I don't remember how they look but I think the fl may have pink hair and the ml has black hair I'm guessing, and his world was filled with Technology and machines, and also she went back to her world and wanted to meet the ml but he gad already lost his memories. Please tell me the name if you know it.