i think the first one is this: http://www.mangago.zone/read-manga/saiyaku_wa_boku_o_suki_sugiru/
Red string of fate: http://www.mangago.zone/read-manga/akai_ito_no_shikkou_yuuyo/
First one: http://www.mangago.zone/read-manga/saiyaku_wa_boku_o_suki_sugiru/
Second one (I have no idea, but I have a few guesses): http://www.mangago.zone/read-manga/otokokemono_desu/mh/c002/
http://www.mangago.zone/read-manga/koyubi_wa_amaku_sasayaku/an/koyubi-wa-amaku-sasayaku-chapter-1.html
http://www.mangago.zone/read-manga/akai_ito_no_shikkou_yuuyo/nmt/c001/
OMG thank you for all your help , I finally found it, THANK YOU
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About accidentally opening a pandora box, then they both have a flower tattoo, then if they are save from misfortunes, one petal dissappear
Then the other one it's about, he can see the red string of fate
I forgot the title, my phone bookmarks got reset
Thank you