Rui Jun started taking erhu lessons from Ms Wang Jing in 2007. In 2009, he continued his studies under the tutelage of Ms Shen Qin, obtaining a Grade 8 Certificate of Distinction in the graded examination conducted by the Central Conservatory of Music in the same year. He obtained his Grade 9 Certificate of Distinction the following year, and his Diploma Certificate in 2016. He has also learnt the jinghu from SCO concertmaster Mr Li Bao Shun, as well as Mr Guo Si Quan.
A passionate and versatile performer, Rui Jun has participated in the productions of many different organisations and served in the capacity of a soloist as well. As an active leader, he was the Erhu I Principal of the Raffles Institution Chinese Orchestra (Year 1 – 4 Section) in 2010. In 2012, Rui Jun took on the role of Huqin Sectional Leader of its Year 5 – 6 counterpart. After joining the Raffles Alumni Chinese Orchestra (RACO) in 2010, he served as the Huqin Sectional Leader in 2014, assuming the role of co-conductor since 2016. Rui Jun also lead as the Chairperson of the Ding Yi Youth Ensemble from 2015 to 2016. Since joining the Singapore Management University Chinese Orchestra in 2015, Rui Jun has served as its concertmaster. He is also currently a member of the huqin quartet Stringanza, having joined the group since 2014.