Na Hee-Do and Back Yi-Jin, they meet when they are 22 and 18, hurt each other when they are 23 and 19, learn to trust each other at 24 and 20, and fall in love at 25 and 21; thus the title is Twenty five twenty one. This drama was everything I needed to watch atm. Loved when Yi-Jin’s mother tells him to find a soulmate who makes you believe in you, who makes you want to be a better person and he immediately starts thinking about Hee-Do. Loved their chemistry but my most favourite scenes were Ko Yu-Rim and Na Hee-Do’s. They have my heart. <3