Roughly half of all tenancies are based on a unique system known as jeonse, or " key money" .
大约有一半的租约是基于一种独特的系统，称为长期租约，或“关键钱”。
经济学人（汇总）
Under a jeonse contract, the tenant pays the landlord a deposit of between 60% and 80% of the purchase price to live rent-free for two years.
根据长期租约，租户需要房东支付购房价格60%至80%的押金，以换取两年的免租金生活。
英语百科
Jeonse
Jeonse (Hangul:전세;hanja:傳貰) is a real estate term unique to South Korea that refers to the way apartments are leased. Instead of paying monthly rent, a renter will make a lump-sum deposit on a rental space, at anywhere from 50% to 80% of the market value.