This is shoulder season airfare special. Normally, the shoulder season is higher than low season airfares. Korean air announced this special airfares and only avaiable until 4th February.Prices are subject to change without prior notice and depends on the space availability.
Korean air offers affordable airfares to Asian, such as Bangkok fare. There is the 2 flights options: one leaves from LAX in the morning/early afternoon, another one leaves from LAX in the evening.
This is the special fares which comes with some restrictions.