As of currently, Do Hwe Ji primarily models for Tomnrabbit ^^
If you are implying that Kei Nangon may be Do Hwe Ji, I highly doubt it. From doing some quick Internet searches, I discern that Kei Nangon has done influential works in both South Korea and Japan, postponing her model/actress career indefinitely to go study at Stanford. She was born on April 12 and is 172cm tall. She was also rumored to be Kim Jonghyun’s ex-girlfriend (prior to SHINee’s debut).
Do Hwe Ji never studied in America, but she has studied abroad in Singapore. She has never done any sort of acting in Japan (though it can be speculated that she may have participated in some films/CFs in Korea due to her many friendships with celebrities). Do Hwe Ji’s birthday is on May 6 and she is 168cm tall.
Hope this helps! ^^