Background: Yen was born in Guangzhou, China. His mother, Bow-sim Mark, is a Fu Style Wudangquan (internal martial arts) and Tai Chi grandmaster, while his father, Klyster Yen (Zhen Yun Long ), is a newspaper editor. When he was two years old, his family moved to Hong Kong and then to Boston when he was 11. His younger sister, Chris Yen, is also a martial artist and actress, and appeared in the 2007 film Adventures of Johnny Tao: Rock Around the Dragon.
Context: Yen describes himself as a mixed martial artist. He learned Tai Chi from a young age under his mother's tutelage. He then wanted to learn Taekwondo in his teenage years, earning a 6th Dan in the process. At the time, the Beijing Wushu Team had a scout in the United States and invited Yen over to Beijing, China, where he began training at the Beijing Sports Institute, the same facility where champion-turned-actor Jet Li trained; this is where the two of them crossed paths for the first time.  Upon his return to the United States, Yen won gold medals in various wushu competitions.  Yen later went on to discover and seek knowledge on other martial arts styles; he would later obtain black and purple belts from judo and Brazilian Jiu-Jitsu, respectively, and went on to study the art of Parkour, Wrestling, Muay Thai, Kickboxing and Boxing under various trainers. His exposure to mixed martial arts (MMA) was heightened when he went back to the United States from 2000 to 2003. While making his Hollywood debut, he also took time off to learn the various martial arts forms. Yen's progress was evident when he returned to Asia, where he implemented his newfound knowledge of MMA, showcased in films such as SPL: Sha Po Lang (2005), Flash Point (2007), and Special ID (2013).  Near the end of 2007, Yen added a new martial arts system to his arsenal. He was offered the role of Wing Chun grandmaster and mentor of film star Bruce Lee, Ip Man, in a 2008 film named after the grandmaster. He worked hard and studied Wing Chun under Ip Man's eldest son, Ip Chun, for 9 months before tackling the role. Ip Chun has since praised Yen for his effort, his skills as a martial artist, and his ability to grasp the full concept of Wing Chun much faster than anyone else he has taught.  Yen believes that combining many martial arts together will produce the most effective and harmonious style. Yen has said, "When you watch my films, you're feeling my heart." He believes in practical combat, and in his opinion, MMA is the most authentic type of practical combat. He has mentioned that he would have competed in the Ultimate Fighting Championship if he did not have a recurring shoulder injury.
Question: did anyone else teach him?
Answer: Beijing Sports Institute, the same facility where champion-turned-actor Jet Li trained;

Problem: Background: Vlachs (English:  or , or rarely ) is a historical term and exonym used for the Eastern Romance-speaking peoples especially in the Balkans. The term also became a synonym in the Balkans for the social category of shepherds, and was also used for non-Romance-speaking peoples, in recent times in the western Balkans derogatively. Apart from the Romanians and Moldovans, there are indigenous Romance-speaking groups in Greece, Albania and Macedonia, such as the Aromanians and Megleno-Romanians. "Vlachs" were initially identified and described during the 11th century by George Kedrenos.
Context: The word "Vlach" is etymologically derived from the ethnonym of a Celtic tribe, adopted into Proto-Germanic *Walhaz which meant "stranger", from *Wolka- (Caesar's Latin: Volcae, Strabo and Ptolemy's Greek: Ouolkai).  Via Latin, in Gothic, as *walhs, the ethnonym took on the meaning "foreigner" or "Romance-speaker", and was adopted into Greek Vlahi (Blakhoi), Slavic Vlah, Hungarian olah and olasz, etc. The root word was notably adopted in Germanic for Wales and Walloon (German: Welsch), and in Poland Wlochy became an exonym for Italians. Via both Germanic and Latin, the term started to signify "stranger, foreigner" also in the Balkans, where it in its early form was used for Romance-speakers, but the term eventually took on the meaning of "shepherd, nomad". The Romance-speaking communities themselves however used the endonym (they called themselves) "Romans". During the early history of the Ottoman Empire in the Balkans, there was a social class of Vlachs in Serbia and Macedonia, made up of Christians who served as auxiliary forces and had the same rights as Muslims. In Croatia, the term became derogatory, and Vlasi was used for the ethnic Serb community.  Romanian scholars have suggested that the term Vlach appeared for the first time in the Eastern Roman Empire and was subsequently spread to the Germanic- and then Slavic-speaking worlds through the Norsemen (possibly by Varangians), who were in trade and military contact with Byzantium during the early Middle Ages (see also Blakumen).  The term "Vlach" is used in scholarship for the Romance-speaking communities in the Balkans, especially those in Greece, Albania and Macedonia.
Question: What traits do they have?
Answer: