Singer Sung Si-kyung returns to his main career after overcoming the pain of being betrayed by a manager he worked with for 10 years. Sung Si-kyung participates in the OST "On Some Day, With Some Heart" for JTBC's new weekend drama "Waiting for Kyung-do." The song will be pre-released on December 4.

"On Some Day, With Some Heart" is a song composed and sung by Sung Si-kyung, carefully building an emotional line. Lyricist Shim Hyun-bo completed the lyrics by referring to the script, focusing on the emotional flow of Kyung-do, played by Park Seo-joon. Sung Si-kyung, a representative ballad singer of South Korea, contributes to the OST, which serves as a guarantee of the drama's quality.

Every winter, Sung Si-kyung has shown a strong presence by releasing deeply emotional music. This time, "On Some Day, With Some Heart" is also highly anticipated even before its release. Sung Si-kyung plans to express the lyrical atmosphere and deep emotional line of the drama with his vocal tone, leaving a lasting impression. His deep voice and calm resonance are expected to enhance the immersion of the drama.

The drama "Waiting for Kyung-do" is a romance drama depicting complex emotions as Lee Kyung-do (played by Park Seo-joon), who has experienced two relationships, and Seo Ji-woo (played by Won Ji-an), who is a reporter that reported on an affair scandal and the wife of the scandal's subject, reunite. The drama premieres on December 6 and airs every Saturday at 10:40 PM and Sunday at 10:30 PM on JTBC.

The OST "On Some Day, With Some Heart," featuring Sung Si-kyung, will be pre-released on various online music sites from 6 PM on December 4, before the drama's first broadcast. Attention is focused on how his music will harmonize with the drama along with Sung Si-kyung's return.