"Warning: Yuri content: This manga contains materials that might not be suitable to children under 17. By proceeding, you are confirming that you are 17 or older."Yuna has kept a secret for ten whole years: she has a crush on her best friend, Da-hye. It's a secret she intends to keep for the rest of her life, but the new year brings a lot of surprises: including a strange new woman named Zoey, who just might change everything. Caught between two women, Yuna's one-sided crush just might die down…or turn into something else entirely. After a whole decade of pining, is it time for Yuna to finally find her happy ending? And if so, who will be the one to ultimately grant it to her?Unrequited Love Skill / Jjagsalang-ui Seukil / Jjaksarangui Skill / Jjakssarange Seukil / Secret Love Skill / Skill of Unrequited Love / 暗恋的技巧 / 짝사랑의 스킬 / 짝사랑의스킬