Singer and actor Rain will be on "Running Man" with f(x) Krystal and the cast of "My Lovely Girl."

According to a related staff member, the cast of "My Lovely Girl" filmed the upcoming episode of "Running Man" on September 1.

People have high hopes for Rain and Krystal's collaboration despite their 13 years age gap.

The date the 'Running Man' episode will air has not yet been decided.

"My Lovely Girl" is an upcoming television drama about Hyunwook (Rain), an entertainment agency composer and producer with a lot of secrets. After the passing of his girlfriend, Hyunwook meets her youger sister, Sena (Krystal), who dreams of becoming a top music producer.

The show will premiere on SBS on September 17.