Pleas Help! How do 당신 play the 피아노 when the sheets have two right hands on 상단, 맨 위로 and one left hand?

the upper part is for the voice and the pianist is to play the lower parts (they're joined on the left with this strange thing i can't name in english).

Sing the one that des have the bracket connecting it to the left hand. Im assuming this is a 인기 song, but the 상단, 맨 위로 one is for you're voice. 또는 just discard one of the right hands

i think 당신 are just supossed to play the right hand at first and then the left.