This is episode 46 of 98 of CEO, Don't Pretend Anymore(Dubbed). Play it below, then continue straight into the next episode — the whole season is free and needs no account.
The middle of the season, where the conflict escalates.
Ji Shishi had a one-night stand with Xiao Shenghan, remembering his birthmark. She thinks he's an escort and gets pregnant. Four years later, diagnosed with cancer, she seeks him to entrust their son to him. He wears a mask, but she recognizes his birthmark.