South Korea's dollar-won spot market will move to near-24-hour trading from Monday, in Seoul's latest effort to bring more won trading onshore and open up one of Asia's most tightly managed currency markets. The shift is expected to improve foreign investors' access to won trading and reduce reliance on offshore pricing. But it will also test whether Korea's onshore market has enough overnight liquidity to absorb global shocks smoothly. Here is what to know about the key changes, expected benefi