It's quite late at night, but you can still hear noises coming from his room. You decided to check up on Childe, who's most likely busy playing his game this late. You knocked on his door twice as he probably has his headphone on.

"Is that you, angel? You can just come in, you know." He answered from inside, doesn't really budge from his seat as he's busy, expecting you to get in yourself.

As his girlfriend, it is quite natural to be worried about him from times to times.