1.Mim Minseok, who sings the opening OST, also performed with in duo "MeloMance" the OST for "Business Proposal"  "Love, Maybe" . His timbre is very touching and instantly recognizable, and his songs are simple yet extremely effective. Here, he is perfect song for the romcom drama’s opening scene. However, while the song and his voice are pleasant in their simplicity and sensitivity, the "Business Proposal" OST was much more memorable i think. In Dynamit Kiss the same ( commercials and musical)  ingredients are used, but without adding anything uniquely special. Why was he chosen?  Because in this drama, the vibe of "Business Proposal "is clearly present: 1.misunderstandings, 2.a couple with explosive chemistry, 3. based on a lie. But after episode 4, the story takes a dramatic turn and diverges from "BP ", whereas the opening remains light until the end.

2.“Say You Love Me”  by WENDY — an emotional soprano performance, very “Korean voice,” always touching with its delicacy and never relying on power (the characteristic vibrato and strength typical of K-drama singing). Yet the song remains bright and not tragic. It speaks of the desire to hear a declaration of love — a classic K-drama theme — effectively supporting the story.

3. "Don't Give Me Up"
— a more pop and youthful track. It reflects the spirit of the early, light-hearted episodes but does not leave a lasting impression.

4. "Face to Face" — the most successful tracks of this romcom, rhythmic song with a memorable chorus. Its vibe recalls 90s American music, with a Korean twist. Performed by "The Stray", it seems aimed at an international audience; its style reminds me of Kodaline.

5.Klang — “Romantic Rebel
” — after a 90s-style song, we now have a 70s-style track: classic rock :))  (The Animals…), energetic and punchy. This style perfectly suits the early episodes, highlighting the hero’s energy, charisma, and subtle narcissism.

6.And finally Sang-Geun’s with the song "  A Lie That Says I'm Fine  — a ballad for which you should bring out the tissues: one of the most melancholic, with Jeon Sang-Geun’s voice and minimalist instrumentation. The focus is entirely on the vocals, which soar into high notes in the chorus — typical of Korean dramas from 2016 and earlier.

Overall, the entire OST provides a true journey through time (commercial choice i Think) . Each track finds its own listener, its own era.
 Personally, my top choice is "Face to Face", which I’ve even added to my K-drama playlist to listen to in the car. Second place goes to Jeon Sang-Geun’s performance for its emotional, soul-stirring quality, reminiscent of 2016 K-drama culture… and the emotions we love (it’s impossible not to love this type of song if you enjoy pure K-drama romance ;) ). Both of these songs also perfectly capture the charismatic hero by Jang Ki Yong: you listen, and you see him through the music.