After Transmigrating into a Scumbag Alpha, I Became the Female Lead’s White Moonlight (GL)

Synopsis: 

The System: "Please, Host, strictly follow the character setting to complete the plot, care for the protagonist omega's physical and mental health, and achieve a perfect, great harmony ending."

Chi Huan: "A gentle female supporting character, I can do that."

The System: "No, you are the protagonist omega's original, scumbag Alpha."

Chi Huan: "???"

Chi Huan wiped her face, and bitterly formulated a "Female Lead Care Package" for herself—donning a disguise to play the female lead's empathetic older sister.

When the female lead learns the truth about being a stand-in and is heartbroken:

Chi Huan's Surface Act: "To resemble her even slightly is your good fortune."

Behind the Scenes: "Don't cry! Scumbag Alphas are no good. Hugs~"

When the White Moonlight returns to the country:

Chi Huan's Surface Act: "True love has returned. You can't even compare to one of her fingers!"

Behind the Scenes: "She's just gaslighting you. Don't believe her!"

When the frail little Omega rises up in resistance:

Chi Huan's Surface Act: "Are you rebelling against me? Who taught you to mutiny?"

Behind the Scenes: "You must be brave and resist! Otherwise, the Scumbag Alpha will think you're an easy target. Don't be afraid, I'm behind you~"

Chi Huan: "I'm mentally exhausted, who can I tell?"

Reading Guide: 

Female Alpha (A) and Female Omega (O). No 'dangly bits,' no pregnancy.

The plot direction is slightly 'ghostly/oddball' . The original host did not die (it's not a forced occupation of someone else's body), and the ultimate boss is hidden very deeply.

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One-Sentence Summary: Transmigrating into a book comes with risks, proceed with caution when being a Scumbag Alpha.

Theme: Only by treating others sincerely can you gain true affection.