The gifts in "The Carol" MV indicate Loona members in which HeeJin, HyunJin, and HaSeul is eagerly waiting for ViVi to join LOONA 1/3 unit. For example, leader HaSeul is carrying 11 gifts signifying the 11 members of Loona. #LOONATHEORY cont. below
In the beginning of the MV, the first member HeeJin is carrying one gift. She walks to the place where the second member HyunJin is eagerly waiting for her. After meeting HyunJin, they both carry two gifts. (HyunJin doing her cat thing) 😆