Which popular K-Drama couple has absolutely zero on-screen chemistry?

Question

Accepted Answer

Determining which K-Drama couple lacks "chemistry" is highly subjective, as viewers often have different standards for what constitutes a believable romance. However, based on widespread viewer discussions, reviews, and social media discourse, here are a few couples that frequently appear in lists regarding "lack of chemistry":

Lee Min-ho and Park Shin-hye (The Heirs): Despite the massive popularity of the drama, many fans felt that the leads lacked a spark. Critics often pointed out that their interactions felt stiff and that the "fated love" trope didn't translate into a genuine emotional connection between the two actors.

Nam Joo-hyuk and Shin Se-kyung (The Bride of Habaek): This pairing is frequently cited in online forums. Many viewers felt that the cold, detached nature of both characters—combined with a somewhat confusing script—resulted in a romance that felt forced and lacked the warmth expected from a fantasy-romance lead couple.

Rain and Krystal (My Lovely Girl): While both are talented performers, many audience members felt a significant "age gap" barrier that made their romantic scenes feel awkward rather than heart-fluttering. The chemistry was often described as more "sibling-like" or "mentor-mentee" rather than a passionate romance.

Jung Hae-in and Chae Soo-bin (A Piece of Your Mind): While this drama was praised for its cinematography and soft aesthetic, many viewers found the pacing too slow and the emotional connection between the leads to be somewhat distant. Some fans felt the leads were "too polite" with each other, failing to ignite the screen.

Why does this happen?

Script Limitations: Sometimes, even the best actors cannot save a poorly written romantic arc that lacks meaningful dialogue or development.
   Directing Choices: A director might prioritize a specific "mood" or "aesthetic" that inadvertently suppresses the natural playfulness or tension between actors.
   Lack of Personal Synergy: Chemistry is often an intangible quality. Sometimes, two actors simply do not have the natural rapport required to make a scripted relationship feel authentic to the audience.

Do you have a specific drama in mind where you felt the connection was missing? I would be happy to analyze the common criticisms of that particular show!