Who is the person chatting with Rohidu?

Bai Luo learned that Bai was actually her netizen "glutinous rice cake" for many years, and she could not help but pour out her full love. This clip comes from the Korean drama Twenty-five, Twenty-one. "Twenty-five, Twenty-one" tells the story of Bai Heluo's youthful love from the first meeting with 18 at the age of 22 to the love with 2 18 at the age of 25.