Marco Rose's men threw everyone up front but got caught flat-footed following a corner, as Sancho had a lot of green ahead and teed up for Haaland, who put the result beyond doubt after wrapping up his brace in the 78th minute.
The match ended 1-1 at full-time, and both sides had opportunities to win in a penalty shoot-out but Qian Jiegei hit the bar while R&F scored all five to seal the win.
The Changchun team went ahead in the ninth minute with a header from Tan Long.
"I just came back from the training camp of the national team and everything is so familiar to me," said the 20-year-old side hitter, who helped China claim the World Cup title a year ago in Japan. "I will work with my teammates and get well prepared for the upcoming games."
In Chilean capital Santiago, Colo-Colo defeated Uruguay's Penarol 2-1 while Brazil's Santos were held to a goalless home draw by Paraguayan side Olimpia. Enditem
The French striker was one of the seven PSG players that tested positive before the new season and missed their opening three games - of which PSG suffered defeats to Lens and Marseille and won 1-0 over Metz.
After the result, Chongqing pocketed three wins consecutively to rank fifth, while Qingdao remain seventh among eight sides in the Suzhou division. Enditem
Bremen needed 30 minutes to gain a foothold into the game as Joshua Sargent tested Alexander Scholow with a long-range effort.
Dominik Greif, the man guarding the visitor's goal on the opposite end, erased the home team's greatest scoring chance in a similar manner in the 81st minute after a square pass attempt.
Stage One involves 32 groups of four players, with the player who tops each group progressing to Stage Two.
Gilbert and Lu met in the last match of the group both with one win and one draw. The world No. 11 won the final frame to draw 2-2 with Lu but advanced by claiming the highest break of 98.