Why people keep saying Garen and Katarina are a couple? They slaying each other

This is crazy. I haven't play this game since the day people here told me Garen and Taric are not offcial. Just came back here because the SG animation looks really cool. And I saw the thread about Garen and Katarina here, since when they become offcial couple now? I mean, they are two killers, why people think it's romantic? Can anyone get the offcial group to tell us what they are? BTW I really like the SG concept.https://imgur.com/wqhnrmS
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