Popular group INFINITE participated in their first OST for a new sitcom.

INFINITE released the OST, "She's A Fantasy," for the MBC sitcom, "What Is Mom."

The song is written by well-known producing team Sweet Tune, who also worked with the group before with "Be Mine", "Paradise" and "Chaser."

INFINITE commented, "We are happy to show our support for member L through our first OST song since our debut. It's been a while for us to release any new material since 'The Chaser' and 'That Summer' concert so we hope this will be a nice gift to our fans."

Internet users commented, "Glad to see INFINITE's close friendship", "I can't wait for INFINITE's new OST song" and "Excited to see L's acting in the sitcom."

"What Is Mom" will air its first episode today on October 8.