The Big Man (Season 1)

Matvey is a charming but insecure guy with excess weight. He lives with his mother, who is used to taking care of him as a little one, and works for a large IT company together with two of the same "quiet geniuses". Matvey has long been in love with Sveta, a bright beauty from his office who sees him as a good friend. One awkward attempt to take a step forward ends in rejection, and Matvey decides it's time to change.