TIP: Alphabetic succession; a game starting mission setting similar to an American season.
Setting "15=" as the beginning of the code indicates that this season has a starting mission setting similar to an American season--
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S15, where one team would be eliminated right after it.
Alphabetically sequence of the number:
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15=O, 18=R, 2=B. Rearrange them and you get ROB. '+' in Chinese is pronounced as "Jia". Two "+" means "Jiajia."
Therefore the code means
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Rob and Jiajia were eliminated right after the starting mission.