You're a Bodyguard, Not a Thug

You're a Bodyguard, Not a Thug Plot:

Young heiress Su Wan hires a burly, fierce-looking man as her bodyguard to escape stalkers and family pressure for blind dates. At first, he’s stern and overbearing, so Su Wan sneers at him as a “thug in a bodyguard’s uniform” and defies his rules at every turn. But when a stalker corners her outside her apartment building, the so-called thug steps in to shield her, fending off the attacker with skilled moves. Su Wan finally sees his kindness and professionalism beneath his tough exterior, and their awkward chaperone life takes a brand new turn.