I'm sure you don't want to keep the original page title because you're Korean Hmm thats interesting. I could accuse you of changing the page because you are Chinese, but thats a tit for tat move thats pretty lame.  

 No need to get angry and rabble out all your accusations and facts. instead of the completely unknown "Lake Chonji". It seems you are out on a plan to expand everything on China.  

 I have already repeated "Tianchi" is already used in other places in China and about the monster in the lake, that seems to be something like the Asian counterpart of the Loch Ness monster. Most of the search items are simply tourist information (since China is the only way to tour the mountain), the mountain's name is Korean (no need for a Chinese name of the lake), and the title that is the most clear should be used. "Tianchi" is name for numerous other places, including a place called "Urumqi".  

 We cannot just rely on google and other search engines alone. They are pretty crude for estimating how many articles are on the web, and it includes sites that do not relate to this article, like news articles, and company websites. "Tianchi" will bring up any webpage with a word "Tianchi", and that means it will include anything, even an article that mentions "Tianchi" once.   
 If your case is strong, go argue at the Baekdusan talk page.