Did Ma and Ding kiss?

No, they are just friends, not lovers, so they have never kissed.

Qi Xin is Ma and Ding's partner. Many people like it and have gained a lot of cp powder. Because some cp powders are irrational, they really think that Ma and Ding are lovers, but their cp is only released by the company. They are all straight men and don't like men. They are just brothers who have been together for many years, and other CPs of the Youth League are also released by the company because of the hot speculation of CP.