The optional pool fee varies from KRW 7,500 to KRW 30,000 per person, per session. For the 7-10 AM session, the fee is KRW 15,000 per adult and KRW 7,500 per child. For all other sessions, the fee is KRW 30,000 per adult and KRW 15,000 per child in July and August. The fee is KRW 20,000 per adult and KRW 10,000 per child from January-April and November-December. The fee is KRW 25,000 per adult and KRW 12,000 per child in May, June, September, and October.