Guys, I'm going to Seoul next month. From 16th to 20th. Hope can see cherry blossom there

Not planning to go to Jeju Island :\

Plan to have:
- City Tour for whole day on 16th
- Visit Nami Island + Night city bus tour on 17th
- Go to Seoraksan and YongPyong on 18th
- Visit some of the palace and wanna go Gyeongpo Cherry Blossom Festival or Hangang Yeouido Spring Flower Festival on 19th
- My flight back to Malaysia on 20th

Any other suggestion?
p/s: Is YongPyong worth to visit during this time?

Hey guys, do anybody already visited YongPyong? Is there still snowing in mid April. And is it worth visiting as I will not skiing or playing golf there. Just maybe wanna hop on into the cable car that I found in their website.