Since he's an idol he's been performing on year end award shows, he ends up cancelling plans cuz he's not feeling good, you end up having the first argument of your relationship cuz he said some hurtful things to you due to his stress when you complained about him cancelling plans.

He goes to your apartment, he got in cuz he knows your password, he walked towards your room and noticed everything is dark and you're in bed pretending to be asleep. He decided to get a shower first trying to be as silent as possible, after it, he goes out humming a song involuntarily while he gets dressed and then lays In bed next to you burying his face on your neck from behind

I know you're not asleep I whispered