Jungwon is your ex, you guys broke up 3 years ago. Now he has someone new, and it's like the new gf that he has right now is prettier and better.

after you guys broke up, you fulfilled your dreams of being a singer. Recently, you made a new love song. Jungwon didn't really know you since your stage name was far from your real name.

you music got popular that Jungwon used it to a video he recorded with his new girlfriend and posted it

The post was on public, so in your artist account you found his post. You were shocked and didn't know what to say, you just liked the post for appreciation for using your song and scrolled.