Both are work place romance.
Step by step is a story about Jeng who is fierce digital marketing manager despised by his subordinates in the company. As son of the owner, there's little he can do about it.

In both dramas male lead accuses female lead for the death of his loved one.
Male leads are hellbent in taking revenge from female lead. After a while they realize the truth and starts falling in love with the female lead.

In both dramas male lead accuses female lead for the death of his loved one.
Male leads are hellbent in taking revenge from female lead. After a while they realize the truth snd starts falling in love with the female lead.

Workplace setting, office romance and its a BL.
Paint with love is the story of Phab, an abstract painter who is hired by the owner of a media agency, Maze, to do a painting at a celebrity's wedding.

Though secret seven is not BL, it's also about the main character finding out who is the real guy?
In secret seven I think the female lead gets gifts from a male. She feels it's one among the seven guys.

BL and Engineering college. This has many common tags like BL, Junior-senior and Engineering.
The "Gear" is one of the engineering mechanical devices in the cogwheel system (as in a clock). Having one signifies that one is a student of the Faculty of Engineering. However, to get one, all engineering freshmen must first undergo the SOTUS (acronym for Seniority, Order, Tradition, Unity, and Spirit) system. Arthit, one of the third year seniors, often abuses his power over the freshmen by making them do things against the rules. Freshmen students are practically powerless to complain or resist any orders given by their seniors. Arthit was seemingly unstoppable until Kongpob stood up against the abuses by the former. Continual encounters between the two developed from animosity to something much more affectionate.