Dr. Wu is a Marvel Comics character that appears in Iron Man 3, played by Wang Xueqi.

He is a reknowned scientist, medic, and surgeon that worked alongside Tony Stark and Ho Yinsen in the past.

After Dr. Wu witnessed Tony threatening the Mandarin, Dr. Wu rightfully feared for Tony's life, and vowed to J.A.R.V.I.S. that he would do everything in his power to protect Tony.

Later, after Aldrich Killian died and Trevor Slattery was arrested, Dr. Wu performed an operation that not only cured Pepper Potts of the Extremis virus, but also removed the shrapnel in Tony's heart and fully healed Tony's heart, allowing Tony to live without being dependent on the arc reactor.
Dr. Wu