Mission Cross simply doesn't work.
Firstly, there's the humour that's both cheesy and forced.Then there's the story, that's overly complex and slow.
Had this flick taken its cue from films like "Mr and Mrs Smith" it could have been a worthwhile watch. Instead, the whole affair is pedestrian and largely, unexciting. Even the action sequences feel rushed and formulaic.
As per usual too, there's a dash of the predictable female empowerment, men weak and inept, woke codswallop, rounding out the pervasive atmosphere of mediocrity, hanging over this production.
I could mention the quality acting as a modest upside. Indeed, for the most part, it would be, were it not for the noticeable lack of chemistry, between the two leads.
In summary, a bland "Mr and Mrs Smith" style Korean action comedy, that's a marginal watch, at best.