I thought I was going to die singing YB's "I'll Forget You" at karaoke

I went into this thinking it would be easy, but the "I have to forget you~~" part goes all the way to the third verse, so I thought I was going to die singing it lol. This song doesn't even have an instrumental break, so it's much harder to sing than it sounds. It's amazing how Yoon Do-hyun makes it look so effortless.