을 하고

do ... and; do ... and then

→ 을
phrase Extremely common #52
do ... and; do ... and then Used after a noun ending in a consonant when that noun is the object of 하다 (to do), followed by another action. 을 is the object particle, and 하고 connects 하다 to the next verb. For nouns ending in a vowel, use 를 하고 instead.
KO: 운동을 하고 샤워했어요.
EN: I exercised and took a shower.