Answer
"Do Do Sol Sol La La Sol" was a romantic comedy-drama series starring Lee Jae-wook before his role in "Alchemy of Souls." The story revolves around the journey of Goo Ra-ra, a pianist who moves to a small town and finds love and friendship. Lee Jae-wook portrayed the charming male protagonist, Sun Woo-joon, who develops a heartwarming connection with Ra-ra.