Both The Target and The Man from Nowhere* are about desperate rush to rescue a wife/a little girl* by an ex-special security/ex-mercenary*. Both films are fast-paced with well-choreographed action and build-ups leading to climatic kick-ass showdowns with the baddies.
One Sunny Day "OSD" gives the same light heart-fluttering vibes with 2 strangers having to spend a few days together on Jeju Island and unexpectedly find themselves to be attracted to each other at parting, being tentative of their new feelings, and longing after sorting out their emotions. OSD has the added bonus of several scenic sites on Jeju Island as backdrop.
Similarly fast-paced, whacky and funny with several parties waylaying each other in the mission. MGIAA has a lower budget with less flashy action, but compensates with a bumbling spy that is new to the game.