She was originally eliminated in January after losing in a team battle but was given a second chance when judges used a wild card to bring her back.
Choo claimed first place when she performed with fellow contestants Kim Sohee and Kim Hyerim as the group KWIN.
They beat the fan-favorite, British-Korean singer Shannon, with high scores from judges Park Jin-young, Yang Hyun Suk, and Yoo Hee Yeol.
Koreaboo translated Park's praise of Choo's rendition of his song as follows:
“Chrisha Choo perfectly captured the feeling of the swing dance and song. This is beyond anything I could have imagined. Her volume and tone was so refreshing, I could tell she has singing skills. Chrisha Choo was the ace.”
This is the last season of K-Pop Star, a show where the winner will be debuted and promoted by South Korea's top three production companies: Park's JYP Entertainment; Yang's YG Entertainment; and You's Antenna Music.
Choo has an active Filipino fan base on social media and has never shied away from admitting to her Filipino roots.
The 17-year-old singer was born in Cebu City but grew up in San Francisco, California, where she was discovered by talent agency Urban Works Entertainment.