Lee had won the first two qualification events and held a 20.29-point lead over Cha heading into Sunday's free skate. But he finished the Korea Figure Skating Championships in second place with 222.98 points, after earning just 146.18 points in free skate.

Cha, who finished third at the International Skating Union (ISU) Junior Grand Prix Final last year, made some last-minute change to his programs for this competition, and the move paid dividends.

He went back to his free skate routine from last season and attempted only one quadruple jump, instead of two. Cha has experienced ankle and hip pains while working on his quadruple jumps and decided to reduce the risky element for a shot at the Olympics.

Cha opened his free skate with a clean triple lutz-triple toe loop combination and pulled off a flawless quadruple salchow, his only quad jump of the day.

Cha followed it up with a perfect triple axel-double toe loop combination and was mistake free the rest of his program, which Cha capped off with a step sequence, triple loop and change of foot combination spin.

Coached by former Canadian star Brian Orser, Cha will make his Olympid debut in PyeongChang. (Yonhap)