A baby in Front his door - namkookgi -

Namjoon, a middle-class man used to a simple life, comes home one evening to find a baby, Yoongi, abandoned in a basket on his doorstep with a note asking him to care for the child. Despite initially wanting to ignore the situation, the rain forces him to bring the baby inside. Reluctantly, he takes on the responsibility, unsure of what to do next, but feeling a strange connection to Yoongi.

And jungkook?

She's just cafe waiter