According to reports on February 7th KST, the movie 'Secret' finished filming on January 21st after 3 months. After the movie project wrapped up the filming, D.O commented, "I was happy to work with such great director and actors/actresses. I believe the film will present an unforgettable memory to the audience."
Co-lead Won Jin A commented, "I won't forget the special moments I lived as Jung Ah. Please look forward to the movie where the music and love co-exists." Director Seo Yoo Min stated, "Thank you to all staff and cast members for working their best to create an amazing project. I will do my best during the final home stretch so that we can present something miraculous like the two main characters' stories to the audience."
Meanwhile, the movie is a fantasy romance movie that features a piano genius student who meets another student who plays mysterious music in an old practice room. D.O. plays the male lead, originally played by Jay Chou.