On the May 12 episode, Kim Yong Guk along with Kim Ye Hyeon, Joo Jin Woo, and Kim Sung Ri performed the ballad track ''If It Is You'' for the position battle. All 4 trainees proved their talents with an impressive performance but out of all, Kim Yong Guk has garnered the most attention. 

SEE ALSO: Comedian Park So Young and former baseball player Moon Kyung Chan tie the knot

The trainee stole hearts of numerous netizens with his beautiful vocals and is now named the ''hidden jewel'' of 'Produce 101' season 2. 

Under the many headlines about Kim Yong Guk, netizens commented, "I didn't know he existed. I just found out about him today lol But I was like 'Oh he's good looking. Who is he? And then I looked at him again because he sings so well", "His vocals are so pretty.... My pick starting today!", "His voice is amazing. I hope he enters the top 11", "Kim Yong Guk is so charming."

Kim Yong Guk ranked 35th on the May 12 broadcast but he's expected to climb up the rankings now.