Travelling from Korea to Indonesia with 22 hours layover in Chengdu Airport

The first and the most important detail is that your itinerary is eligible for 24 hour visa free transit and you do not need any kind of visa under the assumption that Chengdu is your only stop within mainland China!

When we talk about 24 hour visa free transit it is usually understood that the passengers will remain airside (within the transit area), but when the layovers are longer as it is yours, then the officials usually offer a temporary entry permit, allowing you to exit the airport. In any case, upon your landing in Chengdu, the first thing that you will do is to approach 24/144 hour visa free transit counter, where you will apply for a temporary entry permit by presenting your flight tickets. Your chances to be granted a permit are almost certain because of your very long layover. When your permit is granted, you will head to the immigration and then to the city to enjoy some time on your own. Also, I am more than certain that the airport officials will understand that you did not book any accommodation because of the uncertainty whether you will be granted a permit or not. Have a nice journey.