Actor Yoo Yeon-seok lends his voice to the drama's OST.

Currently starring in MBC-TV's When the Phone Rings, Yoo Yeon-seok has recorded the original soundtrack (OST) titled Say My Name.

Say My Name is the theme song for Baek Sa-eon, Yoo Yeon-seok's character. The emotional ballad conveys his deep feelings for Hong Hee-joo, played by Chae Soo-bin.

Yoo Yeon-seok not only performed the OST but also actively participated in the songwriting process, suggesting "sunset" as a key theme to enhance the song's depth and message.

A production representative noted, "This song will be featured in the final episode of When the Phone Rings, delivering profound emotion and lasting resonance to viewers."

Meanwhile, When the Phone Rings concludes on the 4th, with Say My Name set for release at 6 PM that day.