Forget the fusion stuff in fancy malls. Soi 12 off Sukhumvit Road has a proper Korean enclave with restaurants run by actual Korean families. Jang Su Jang does perfect bulgogi and their kimchi jjigae is exactly like Seoul

Prices are reasonable — Around ฿200-300 for main dishes, way cheaper than the K-pop themed places in Siam. The banchan (side dishes) are refillable and they don't water down the flavors for Thai palates. Walking distance from BTS Asoke station. Most places open for lunch and dinner, some stay open late for Korean drinking culture vibes