Power transmission system for vehicle and vehicle comprising the same

A power transmission system (100) for a vehicle and a vehicle including the same are provided. The power transmission system (100) includes: an engine unit (1); a transmission unit (2a) adapted to selectively coupled with the engine unit (1); a first motor generator (41) coupled with the transmission unit (2a); an output unit (5) configured to transmit power output by the transmission unit (2a) to wheels (200) of the vehicle; and a synchronizer (6) adapted to selectively synchronize the output unit (5) and the transmission unit (2a) so as to drive the wheels (200) of the vehicle via the power output by the output unit (5).