Brand loyalty to rom&nd
Many reviewers explicitly say they trust rom&nd lip products in general and buy new releases automatically, citing past positive experience with the brand's tints and glosses.
Wonhee celebrity/ambassador collaboration
Several English and Japanese reviews mention purchasing because Wonhee is the brand ambassador or because a specific shade is her 'pick', driving impulse purchases.
Limited-edition set with mini gloss gift
A large number of reviews cite the bonus mini-size lip oil (e.g. Soy Peony) included in the boxed 'soy milk carton' set as the key reason for buying, with many wanting the mini shade in full size.
Cute, distinctive packaging design
The milk-carton-style box and unique applicator/cap design are repeatedly named as a purchase driver, especially among Japanese reviewers.
Affordable price and shade range
Reviewers note the price is reasonable especially during OliveYoung sales, and the wide color range lets buyers pick shades matching their personal color type (yellow/blue undertone).