[1] After graduating from Pusan National University, she worked at Korea Occupational Safety and Health Agency.

And in 2006 she became the deputy chair of Federation of Korean Trade Unions's public servants bureau.

She continued to take leadership roles in the trade unions before entering politics for the 2012 general election.

From 2006 to 2011, she has taken multiple roles in formulating labor-related policy, such as a member of sub-committees of then-Economic and Social Development Commission (now-Economic, Social and Labor Council) and the highest governing bodies of National Pension Service and National Health Insurance Service, as a trade union representative.

[8][9] Democratic party leader Lee Nak-yon replaced Han with Hong Ik-pyo to chair the party's policy planning committee[10] Han holds two degrees - a bachelor in environmental engineering from Pusan National University and a doctorate in industrial engineering from University of Nottingham.