diff --git a/lua/Trans/core/buffer.lua b/lua/Trans/core/buffer.lua
index 1cc6adc..fb4dbae 100644
--- a/lua/Trans/core/buffer.lua
+++ b/lua/Trans/core/buffer.lua
@@ -160,10 +160,11 @@ end
 
 ---@nodiscard
 ---TransBuffer constructor
+---@param bufnr? integer buffer handle
 ---@return TransBuffer
-function buffer.new()
+function buffer.new(bufnr)
     local new_buf = setmetatable({}, buffer)
-    new_buf:init()
+    new_buf:init(bufnr)
     return new_buf
 end
 
diff --git a/lua/Trans/core/frontend.lua b/lua/Trans/core/frontend.lua
index 148831b..f4c3396 100644
--- a/lua/Trans/core/frontend.lua
+++ b/lua/Trans/core/frontend.lua
@@ -3,30 +3,6 @@ local conf = Trans.conf
 local frontend_opts = conf.frontend
 
 
----Setup frontend Keymaps
----@param frontend TransFrontend
-local function set_frontend_keymap(frontend)
-    local set = vim.keymap.set
-    local keymap_opts = {
-        silent = true,
-        -- expr = true,
-        -- nowait = true,
-    }
-
-    for action, key in pairs(frontend.opts.keymaps) do
-        set('n', key, function()
-            local instance = frontend.get_active_instance()
-
-            if instance then
-                coroutine.wrap(instance.execute)(instance, action)
-            else
-                return key
-            end
-        end, keymap_opts)
-    end
-end
-
-
 ---@class TransFrontend
 ---@field opts TransFrontendOpts
 ---@field get_active_instance fun():TransFrontend?
@@ -34,6 +10,7 @@ end
 ---@field wait fun(self: TransFrontend): fun() Update wait status
 ---@field execute fun(action: string) @Execute action for frontend instance
 ---@field fallback fun() @Fallback method when no result
+---@field setup? fun() @Setup method for frontend [optional] **NOTE: This method will be called when frontend is first used**
 
 ---@class Trans
 ---@field frontend TransFrontend
@@ -47,8 +24,9 @@ return setmetatable({}, {
         frontend.opts = opts
         self[name] = frontend
 
-        set_frontend_keymap(frontend)
-
+        if frontend.setup then
+            frontend.setup()
+        end
         return frontend
     end,
 })
diff --git a/lua/Trans/frontend/float.lua b/lua/Trans/frontend/float.lua
index 671f91b..e8f3a73 100644
--- a/lua/Trans/frontend/float.lua
+++ b/lua/Trans/frontend/float.lua
@@ -1,20 +1,16 @@
--- local api = vim.api
--- local conf = require('Trans').conf
--- local buffer = require('Trans.buffer')()
+local Trans = require 'Trans'
 
--- local node = require("Trans.node")
--- local t = node.text
--- local it = node.item
--- local f = node.format
+---@class TransFloat
+local M = {}
+
+function M.new()
+    -- TODO :
+
+end
 
 
--- local engine_map = {
---     baidu   = '百度',
---     youdao  = '有道',
---     iciba   = 'iciba',
---     offline = '本地',
--- }
 
+return M
 -- local function set_tag_hl(name, status)
 -- local hl = conf.float.tag[status]
 -- m_window:set_hl(name, {
@@ -118,3 +114,10 @@
 --     m_window:map(key, action[act])
 -- end
 -- end
+
+-- local engine_map = {
+--     baidu   = '百度',
+--     youdao  = '有道',
+--     iciba   = 'iciba',
+--     offline = '本地',
+-- }
diff --git a/lua/Trans/frontend/hover/init.lua b/lua/Trans/frontend/hover/init.lua
index 60fd2a7..b72f8f3 100644
--- a/lua/Trans/frontend/hover/init.lua
+++ b/lua/Trans/frontend/hover/init.lua
@@ -17,6 +17,22 @@ local M = Trans.metatable('frontend.hover', {
 })
 M.__index = M
 
+
+function M.setup()
+    local set = vim.keymap.set
+    for action, key in pairs(M.opts.keymaps) do
+        set('n', key, function()
+            local instance = M.get_active_instance()
+
+            if instance then
+                coroutine.wrap(instance.execute)(instance, action)
+            else
+                return key
+            end
+        end)
+    end
+end
+
 ---Create a new hover instance
 ---@return TransHover new_instance
 function M.new()
@@ -27,7 +43,6 @@ function M.new()
     }
     M.queue[#M.queue + 1] = new_instance
 
-    new_instance.buffer:deleteline(1)
     return setmetatable(new_instance, M)
 end
 
@@ -186,8 +201,8 @@ function M:process(data)
         return
     end
 
-    local opts   = self.opts
     local util   = Trans.util
+    local opts   = self.opts
     local buffer = self.buffer
 
     if opts.auto_play then
@@ -210,19 +225,20 @@ function M:process(data)
     local lines = buffer:lines()
 
 
+    local valid = window and window:is_valid()
     local width =
-        window and window:is_valid() and
-            (opts.auto_resize and
-                math.max(
-                    math.min(opts.width, util.display_width(lines) + opts.padding),
-                    math.min(data.str:width(), opts.split_width)
-                )
-            or opts.width)
+        valid and
+        (opts.auto_resize and
+        math.max(
+            math.min(opts.width, util.display_width(lines) + opts.padding),
+            math.min(data.str:width(), opts.split_width)
+        )
+        or opts.width)
         or math.min(opts.width, util.display_width(lines) + opts.padding)
 
     local height = math.min(opts.height, util.display_height(lines, width))
 
-    if window and window:is_valid() then
+    if valid then
         window:resize { width = width, height = height }
     else
         window = self:init_window {