A Fake Proposal: My Tame Coworker is Actually a Wolf in Sheep's Clothing!

I'm the only one who knows his secret.
What is the sweet personality he's hiding behind ugly glasses?

Tadashi transfers to the company where Kasumi works. He has thick glasses, long bangs, a hunched back, and he speaks quietly. He's a dull man who is not typical of someone in Sales. But for some reason, Kasumi is intrigued by him. One day, Tadashi saves Kasumi from her sexually harassing manager. His suddenly sharp, wolf-like gaze is so charming that he seems like a completely different person from his usual, unreliable self!

Source: MangaPlaza