On the upcoming January 30th broadcast of KBS 2TV's 'Vitamin', CNBLUE's Minhyuk surprised viewers with his impressive back muscles.

During a recent filming, the causes and preventive measures of allergies were introduced and the guests were shown getting their skin tested for 55 different types of allergies. While undergoing his physical examination, Minhyuk exposed his back to the camera and surprised fans with his sculpted back that they did not expect from looking at his baby face.

Minhyuk also ranked his fellow�CNBLUE members in terms of their acting abilities during this filming. Other guests that featured on this episode include Choi Byung Suh, Jun Soo Kyung, Kim Sung Kyung, Park Hye Kyung, Han Min Kwan, and Seo Hyo Myung.

The full episode airs at 8:50 PM KST on the 30th!

Tip: sofia