“들어갈” is same as “add”

들어가다 = go in: be used in. 들어갈 = 들어가(다) + -(으)ㄹ(suffix expressing future event, expectation, schedule, etc, like to+[verb] in English. * 할 일이 너무 많다 = There's too much work to do. * 먹을 것 좀 사올게 = I'll go get some food. (먹을 것 = things to eat = food)