Flower Boys Next Door is a webtoon by Hyun-suk Yu.
Looza Goh is a children’s book illustrator whose agoraphobia (fear of unfamiliar places and situations) and anthropophobia (fear of people) keeps her from engaging in any kind of relationship. One day, she sees her handsome neighbor through her window and her days begin to revolve around sneaking peeks into his life. However, her life quickly spirals out of her control when her neighbor’s extroverted cousin moves in and discovers her “hobby”. But despite the chaos, he may be what Looza needs in order to overcome her fears and rediscover what it means to live.
"Flower Boys" in Korean slang just means "Pretty Boys".