Cherry Blossom Ending by Busker Busker is probably the best known spring song in Korea.
Even though it is almost 9 years old it still charts every spring as the cherry blossoms bloom. It would be hard not so find someone in Korea who hasn’t heard this song. Many have also sung it at least in noraebang.
There’s also numerous singers who have done covers of this song.
Here are BTS, Astro, and IU showing how popular this song still is.
Ken from VIXX felt the spring fever while doing art in the park
IMFACT put on their own twist with their cover