"Lion Heart" is a song released by Girls' Generation. It is the first track on their fifth studio album, Lion Heart and also serves as the second single on the album. It was released on August 18, 2015.
The music video narrates a story where the members of Girls' Generation fall in love with a male protagonist, dressed up with a lion mask, who later turns out to be an eight-timing player. They then become upset and turn away from that said cheater. The choreography for the song was created by both American choreographer Tony Testa & SM Entertainment's choreographer Shim Jaewon. The visual was the third most viewed music video on YouTube by a South Korean act in August 2015.