Office Nuna Iyagi

When Manager Son is sent to a new department, his boring office life takes a sweet turn. There, he meets Manager An, an older colleague whose competence and charming aura leave him in awe. But as Manager Son grows closer to her, he realizes there’s more to her strong, independent front than meets the eye. And soon enough, he begins to understand why office crushes can get complicated.

(Source: WEBTOONS, edited)

Note: Chapter count includes a prologue and 3 epilogues.