Minhyun and Ren of the Korean idol group NU'EST were the special guests of KBS' "Superman Returns" recent episode.

During their guesting, they visited the RaRa sisters, Ra Won and Ra Im, which are the daughters of the singer and actor Hong Kyung Min.

In the episode, Ra Won had to go to the doctor's clinic to get a shot, but she was scared. The nurse tried to talk Ra Won into getting a flu vaccine but the child kept shaking her head and hiding her arm. However, Minhyun came to the rescue. The singer as Ra Won if she wants him to get a shot too. "Should I also get one? Do you want Oppa to get a vaccine with you?"

Ra Won said yes, so Minhyun let the nurse inject him with a vaccine. After he was done, he told Ra Won that it didn't hurt at all and assured her that she was going to be fine. Ra Won then allowed the nurse to administer the vaccine.

Everyone loved how Minhyun dealt with the situation. Lots of fans have tweeted and shared their sweet opinions on various SNS. What do you think about it?

Catch "Superman Returns" on KBS TV2 every Sunday.

Check out the episode here: