Kim Dong-chan's second-half equaliser ensured that Jeonbuk, who defeated Al Ittihad in midweek, finished four points clear at the top of the standings at the end of the regular K-League season.
Kim Myung-joong put Chunnam ahead after 17 minutes but both teams eventually had to settle for a point. Topping the table means that Jeonbuk will progress directly to the final of the play-off series.
"I am happy that we achieved our objective and finishing in first place," said Jeonbuk coach Choi Kang-hee.
"We are chasing two targets in the K-League and the AFC Champions League. The atmosphere in the camp is good. The players are focused and we are looking forward to the challenges ahead."
Pohang Steelers finished second after winning 3-1 at Seongnam Ilhwa Chunma.
Sasa Ognenovski scored Seongnam's only goal 12 minutes into the second half to cancel out Koh Moo-yeol's opener.
Koh added a second with 20 minutes remaining and Cho Chan-ho sealed the win soon after.
FC Seoul moved into third place with a 3-0 win at Gyeongnam FC thanks to a second-half hat-trick from Ha Dae-sung. That put them above Suwon Bluewings courtesy of goals scored.
Suwon defeated Jeju United 2-0 with the goals coming from Mato Neretljak and Stevica Ristic but still dropped down to fourth.
Ulsan Horangi and Busan I'Park confirmed also their places in the play-offs.
Busan finished in fifth after defeating bottom club Gangwon FC 2-0 as Han Ji-oh and Yang Dong-hyun struck in each half. Ulsan were held to a goalless draw at Daegu FC.
Elsewhere, Incheon United and Sangju Sangmu also drew 0-0 while Daejeon Citizen defeated Gwangju FC 1-0.