diff --git a/color-module/src/lib.rs b/color-module/src/lib.rs
index 429f3c7..bb9c464 100644
--- a/color-module/src/lib.rs
+++ b/color-module/src/lib.rs
@@ -1,4 +1,4 @@
-use std::str::FromStr;
+use std::{str::FromStr, sync::Arc};
 
 use palette::{
     cam16::{Cam16Jch, Parameters},
@@ -309,17 +309,17 @@ pub fn series(
     let origin_color = Srgb::from_str(color)
         .map_err(|_| errors::ColorError::UnrecogniazedRGB(color.to_string()))?
         .into_format::<f32>();
-    let oklch = Oklch::from_color(origin_color.clone());
+    let oklch = Arc::new(Oklch::from_color(origin_color.clone()));
 
     let mut color_series = Vec::new();
-    for s in expand_amount..=1 {
-        let darkened_color = oklch.darken(s as f32 * step);
+    for s in (1..=expand_amount).rev() {
+        let darkened_color = Arc::clone(&oklch).darken(s as f32 * step);
         let srgb = Srgb::from_color(darkened_color);
         color_series.push(format!("{:x}", srgb.into_format::<u8>()));
     }
     color_series.push(format!("{:x}", origin_color.into_format::<u8>()));
     for s in 1..=expand_amount {
-        let lightened_color = oklch.lighten(s as f32 * step);
+        let lightened_color = Arc::clone(&oklch).lighten(s as f32 * step);
         let srgb = Srgb::from_color(lightened_color);
         color_series.push(format!("{:x}", srgb.into_format::<u8>()));
     }