I'm Your Guardian Angel!(2019)

Naega Neol Haengbokhage Haejul Geonde!

But I'm supposed to make you happy!

Dove has always been the black sheep among his fellow Angels-in-waiting. To finally come into his own as an official Angel, he must make his designated human happy. But his assignment, Ye-Na Jang, is a girl who already has it all — except love. Will Dove be able to fulfill her wishes?

(Source: Manta, edited)

Note: Includes one extra chapter