Who are the door gods in the New Year paintings?

Qin Qiong and Weichi Gong are generally considered.

There seems to be a legend. After Li Yuan became emperor, he often had nightmares at night, dreaming that evil spirits would kill him and ordering them to stand in front of the door to escort him. After that, they slept soundly. After a long time, they switched to their portraits.

Weichi Gong with yellow face and black face.