Ruby Ruby Love (2017)

Both dramas have a female protagonist lacking confidence. The situation changes thanks to a magic ring and romance ensues.

Both are mini dramas with a lead lacking in self confidence or direction in life who undergoes a magical transformation.

Both are mini dramas in which the FL gains confidence and a personality change due to something magical (food vs. a ring).

Both are mini dramas in which the FL has a magical piece of jewelry which gives her confidence and changes her in some way.

Both FLs are withdrawn and agoraphobic, and they use binoculars to people-watch the outside world. Both MLs are their only friend, have kind personalities, and try to bring the FL out of her shell. There's also a SML who the FL has a crush on.

Both have very withdrawn FLs who slowly gain confidence over the course of the story, and more extroverted MLs.

Both are short stories in which the lead acquires some object which changes the appearance of themselves or others, leading to them finding true love.