After a Substitute Marriage, I Discovered My Wife Was a Top-Echelon E-Rank Hero [Interstellar]

[A clear-headed, bright college guy who pretends to be an alpha to marry his sister-in-law in his brother's place x a true Enigma who pretends to be an omega, an aloof gentleman on the surface but a top-level warlord underneath]

Jiang Youlin's eldest brother is the alpha lead in an interstellar ABO romance novel.

On the day of the wedding, his brother suddenly runs away. Jiang Youlin, his omega twin brother, obeys his family's urgent orders, reluctantly leaves school, and returns home. He disguises himself as an alpha and takes his brother's place, bringing his sister-in-law home as his bride.

His spouse is an omega bottom from a top military academy, with a strong build, a narrow waist, and long legs. A single cool glance from him is enough to leave people dazed, weak in the knees, and aching all over.

But he is mild-mannered, refined, and reserved, a gentleman who has never forced Jiang Youlin to do anything he doesn't want.

Jiang Youlin likes his sister-in-law very much and has treated him like one of the girls ever since they married.

Though they never consummated the marriage, after spending day and night together for a while, their life was fairly peaceful and harmonious.

Then an accident causes Jiang Youlin to go into heat early. He can't hold back and receives a temporary mark from his sister-in-law.

He never imagined that his sister-in-law, beneath his military uniform, would shed his usual gentlemanly refinement and become something incredibly sexy and wild. He is simply... so alpha.

Wait, why can he release such powerful pheromones?

Only afterward does Jiang Youlin realize that his sister-in-law isn't an omega at all. He's an Enigma, said to be ten thousand times more terrifying than an alpha!

After that day, Jiang Youlin pretends nothing happened. He ignores the aloof man's every hint and question, playing dumb and asking, “What are you talking about?”

Later, his brother is finally brought back.

Jiang Youlin breathes a sigh of relief, sheds his responsibilities, and returns to campus life.

He feels reluctant to part with his sister-in-law and guilty, but still silently wishes his brother and sister-in-law a happy marriage that lasts a hundred years.

To his surprise, the next day after he returns to school, an S-rank big shot arrives to give a lecture. Rumor has it he's the top student from the military academy, here to offer guidance. He's the Empire's foremost war hero, a man who has rarely appeared in public.

Not only is he an exceptionally capable, low-profile and mysterious figure, he's also the dream Enigma whom all omegas and even all alphas can only look up to.

At the opening ceremony, Jiang Youlin discovers that this big shot is the very sister-in-law he once rolled around in bed with.

Jiang Youlin: O.O ???!!!

That night, the war hero summons him to a luxurious private office on the top floor. The door is locked.

In the dim light, the uniformed man, a full head taller than him, deliberately releases cedar-scented pheromones that make Jiang Youlin's legs weak. Still, he has to act calm.

The war hero toys with Jiang Youlin's waist with long fingers in white gloves, his voice stern and cool, yet tinged with amusement:

“How should I punish you, you little liar who loves to run away?”

--

The war hero is one of the Empire's only three Enigmas, and has spent many years behind the scenes after retiring from public life.

His younger brother, the romantic novel's bottom lead, ran away from his wedding because he was homophobic, so he took his brother's place and married into the Jiang family.

The substitute marriage was only meant to be a temporary measure. Who could have guessed that after getting married, he wouldn't want to go back?

Theme: Love can heal everything