@hyucksbangs , Yes they both main characters. But it is easy to separately recognize two main chapters when we address the Top as ML (Main Lead) and the Bottom as MC (Main Character)
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Omegaverse >ω< https://mangamirror.com/manga-list/106967
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Historical BL ♛➛ https://mangamirror.com/manga-list/122136
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Best stories ⛧⁀ https://mangamirror.com/manga-list/106911