(Yonhap)Seoul Metro has once issued a "map" of subway trains to help passengers avoid being too cold or too hot, as it turns up the air conditioning in the summer heat.There has been a 60 percent increase in complaints regarding uncomfortable heating and cooling conditions on trains compared to the same month last year, Seoul Metro said, issuing guidance on subway usage on Thursday.From January to May of this year, complaints about "being hot" increased by approximately 60 percent. Similarly, complaints about "being cold" increased by about 65 percent.

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