Instructions
Complete the game in Konquest mode once. Return to the Edenia realm at the next opportunity.
Go to the the G-8 square (see Resources) using the map where you find a tent.
Wait until it is midnight Thursday in the game. A chest appears behind the tent.
Open the chest. You receive a "Krypt" key.
Visit the game's Krypt and use the key to open coffin "OT." Liu Kang is now unlocked.