Spring Reverse Harem 2018

The Flame's Daughter Chinese drama on March 1

Nil Admirari no Tenbin: Teito Genwaku Kitan  anime series on April 1

Sweet Punishment anime series on April 1 (unconfirmed and R-18)

Boys Over Flowers Season 2 (Hana Nochi Hare ~HanaDan~ Next Season jdrama on April 17  (unconfirmed)   not a reverse harem

Love x Doc movie on May 11 in Japan

The Ghost Bird series Book 12: Love's Cruel Redemption on May 28

UPDATE 1 3/19/2018: Added The Flame's Daughter
UPDATE 2 8/11/1208 - Boys Over Flowers S2 not a reverse haerm