The German song "Lass mich los" by Madeline Juno perfectly fits to "Happy without me " by MONSTA X
MONSTA X is singing that they break up with their girlfriend cause they realised it's not working out. They are OK with it and think it works the best for both if they go seperate ways cause they realised their girlfriend would be happier if they let lose of eachother. In the song of Madeline Juno she is singing that she broke up with a guy and sings "If you really want me to be happy than let me go. You say it's your priority to know that I'm save and happy but if you really mean it, than let me go"
Do you know two songs who could fit together pretty nicly trought the lyrtics?