best casting in a drama ever like.. I became huge fans of them both after this. this drama has all the genres and tropes you've ever loved. youth, childhood, loser boyfriend, he fell first AND fell hardest, grumpy vs sunshine, angst etc the list goes on. the ultimate feel good drama that makes you cry and laugh in equal amounts. anyone who comments on plotholes etc just does not get the point of this drama who cares about the time travel plot and script in so much detail???? what makes this drama so good is all the tropes and the funniest and cutest scenes between the two. we get to see them grow up literally. high school to college to adult life we get to see them in every single stage of their life. even their families and friends were so entertaining. never been so obsessed with a drama like the before even the OSTs have me in a chokehold. anyone who thinks this drama is less than amazing just hates happiness that's all there is to it.