Song Geon-hee made his acting debut in the 2017 web drama Flat. He quickly gained attention with his supporting role in the hit 2018 JTBC series SKY Castle. In 2019, he appeared in the Netflix series Love Alarm as well as in tvN’s Arthdal Chronicles and KBS2’s Tale of Nokdu. In 2020, he joined JTBC’s fantasy drama Mystic Pop-up Bar and OCN’s fantasy-mystery series Missing: The Other Side. In 2021, he played the brother of Blackpink’s Jisoo in JTBC’s Snowdrop.

Song Geon-hee attended Sejong University.