Yeon Woo Jin and GUGUDAN's Kim Sejeong shared sweet moments at the piano in a new behind-the-scenes clip for "I Wanna Hear Your Song"!

The clip starts with Kim Sejeong looking at the camera and telling that her character, Hong Yi Young, has seen footprints in her home once more. She then advises the viewers, saying, "If you find suspicious footprints in your house, don't try to look for the source, and call the police immediately!"

The video transitions to the next scene, showing the home of Jang Yoon, Yeon Woo Jin's character. While waiting for the filming to start, Kim Sejeong goes in front of the piano and plays a few chords, Yeon Woo Jin who heard her play, compliments her skills.

She then begins teaching him on the chords, making an entertaining situation wherein Yeon Woo Jin, whose character is a pianist, is being tutored by Kim Sejeong, whose a timpanist in this drama.

Even when the lead actors film more serious scenes, they can still keep the mood light on the set. One time, Kim Sejeong laughs uncontrollably directly after the camera stops rolling on account of Yeon Woo Jin's unique piano performance.

In another clip, it can be seen that Kim Sejeong has fallen asleep during downtime, and Yeon Woo Jin, who is sitting next to Kim Sejeong, sweetly fans her with his hands.

The video concludes by teasing the romance making headway between Jang Yoon and Hong Yi Young in the drama. Yeon Woo Jin then shows a heart that is designed on his shirt, and Kim Sejeong comments, "This is Jang Yoon's feelings that he can't say out loud." Yeon Woo Jin agrees and jests, "I will save my words," and Kim Sejeong rags, "You're a bad guy!"

Other characters included in "I Wanna Hear Your Song" are Song Jae Rim, Park Ji Yeon, Kim Sang Kyun, Lee Si Won, and Yoo Gun. The drama premiered on August 5 this year, 2019, and airs on KBS 2TV every Monday and Tuesday at 10 p.m. KST. It has already finished broadcasting 12 episodes, and 20 more to go.