To help the team, Seo In Guk will make a special cameo in Disney+'s new original series 'Soundtrack #1.' Seo In Guk, who was previously announced through the credits, is believed to play singer Jay Joon, who collaborates closely with Han So Hee.

Seo In Guk, who was cast in the show due to his solid working relationship with the crew, stated that he was willing to fire support because he was working on a good project. In particular, as a vocalist in the theater, he intends to delight the audience by performing as a singer for the first time in a long time.

Han Sun Woo (Park Hyung Sik) is a novice photographer in 'Soundtrack #1.' He is quiet and reserved, but he is a generous and warm-hearted man. Lee Eun Soo is one of his pals (Han So Hee). For the past 20 years, they have been close friends.

Meanwhile, Lee Eun Soo makes a living as a songwriter. Her personality is open and vibrant. Han Sun Woo and Lee Eun Soo start living together in the same house for two weeks for a purpose. Their bond blossoms romantically as they stay together.

Seo In Guk launched his singing career after winning the talent reality show ‘Superstar K’ in 2009, and made his acting breakthrough in ‘Reply 1997’ (2012). Since then, he has starred in television series ‘Master's Sun’ (2013), ‘High School King of Savvy’ (2014), ‘Hello Monster’ (2015), ‘Squad 38’ (2016), ‘Shopping King Louie’ (2016), ‘The Smile Has Left Your Eyes’ (2018) and ‘Doom At Your Service’ (2021).