Baeko Gamunui Agi Sommungchi

Soya was the Phoenix clan's treasured youngest daughter. At least, she was until her ninth birthday, when she shifted for the first time and turned into a baby bird with soft white down instead of crimson. She became the family's disgrace overnight, and when the clan's true daughter came home at last, they threw Soya out to die. One fateful night, Soya was moments from death when Sae-on Baek, head of the White Tiger clan, steals her away. All Soya wants now is to stay quiet and go unnoticed in her new home, but unfortunately, her new family seems to have other plans.

(Source: WEBTOON)