KNK rocked out with 'Korean Madonna' Kim Wan Sun�(read more about her here) on the March 11 installment of 'Immortal Song'.

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For the rock special of the competitive show, KNK and Kim Wan Sun were up last with a cover of�Jung Soo Ra's 1988 hit "Hwanhee". With the diva's charismatic vocals and the idol group's energy, it made for a memorable performance. Kim Wan Sun commented, "I liked everything. Since the first time we met until now, it'll be good," referring to her stage chemistry with KNK.

Spoilers Below:

Though the collaboration almost won, it was Park Ki Young�who took the trophy with 440 points.