Fate's Twisted Threads: The Love Enigma

Five years ago, the female protagonist suffered a severe arm injury while saving the male lead, leaving her with permanent aftereffects. When they reunited five years later, the male lead grew suspicious of her identity due to the scar on her arm, but his attempts to investigate were misled by her vague responses and an imposter, causing him to mistake someone else as his savior. Though the female protagonist regained his attention through her exceptional professional skills, the male lead, unaware of the truth, repeatedly hurt her. In the end, the truth was revealed, the villains were punished, and the two lovers were finally united.

Synopsis from DramaGo.