Does anyone know this one?

Does anyone know this older Japanese managa? The guys name is I think Shinobu. He was a worker or salaryman that looked "plain" but was actually gorgeous under the glasses and hair. Anyways he falls in love with his boss that was actually playing him and finds out bc he hears his boss talking to some other guy making fun of the situation. Anywas he keeps his makeover look and decides to transfer to another branch of the job and leave. His boss falls in love with him and is devastated. Tries to talk to Shinobu, you know the whole chasing arch, but he isn't going for it. Shinobu comes back bc his branch has a meeting at his old branch and still has to see his boss. His boss ends up sick in the hospital from exhaustion and Shinobu visits him. They end up together in the end of it.

I cant remember the story but those are some of the points I remember. Please help