Best timing to visit Gangnam for procedures?

Planning my trip to Seoul!

**Questions:**
1. Best season to visit?
2. How long should I stay?
3. Weekday vs weekend?
4. Morning vs afternoon?

**My situation:**
- Planning: rhinoplasty + skin treatment
- From: United States
- Duration: Can take 2-3 weeks off

Would love to hear from experienced medical tourists!

Thanks in advance!