A hydraulic system includes a hydraulic pump to be driven by a prime mover, a first hydraulic actuator, a second hydraulic actuator, a first connecting fluid tube connected to the first hydraulic actuator, a second coupling hydraulic tube connected to the first hydraulic actuator, and a first control valve having a first position and a second position. The hydraulic system includes a second control valve configured to control the second hydraulic actuator, a first fluid tube configured to supply a return fluid to the second control valve, a second fluid tube connected to the first fluid tube, a first communicating-connection tube to be connected to the second fluid tube when the first control valve is in the first position, and a second communicating-connection tube to be connected to the second fluid tube when the first control valve is in the second position.