On the July 25th installment of 'Knowing Brothers', the two legendary solo singers will appear as special guests. In the pre-released clip, BoA and Sung Si Kyung are seen live-singing the songs that were quintessential in their respective careers.
BoA sang "Two People" by Sung Si Kyung, and he, in turn, sang a short medley of BoA's "No. 1" and "Only One". While BoA was singing the ballad, Sung Si Kyung joined in and the two ended up delivering a brief duet!
Stay tuned for the full episode today at 9 PM on JTBC!